Perhaps you should try some spelling variations:
ve triet » va trien
nam thuc » nam thuoc, am thuc, nam thu
nang tai » hang tai, tang tai, nang cao
su triet » su viet, su tien
sang tai » hang tai, sang tao, tang tai
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
so sanh » do sanh
hieu ve » hieu va, hieu van
ve nam » he nam, va nam, le nam
sanh y » sinh y, anh y, hanh y

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh y ((nang tai) OR (sang tai)) hoi. hieu ve nam thuc va hanh vi ((su triet) OR (ve triet))~.
• Adding a wildcard symbol may retrieve word variants: so sanh y ((nang tai) or (sang tai)) hoi. hieu ve nam thuc va hanh vi ((su triet) or (ve triet))*.